<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 添加按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary"
                     @click="showAddCateDialog()">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table class="tree_table"
                  :data="cateList"
                  :columns="columns"
                  :selection-type="false"
                  :expand-type="false"
                  show-index
                  border
                  :show-row-hover="false">
        <!-- 是否有效 -->
        <template slot="isok"
                  slot-scope="scope">
          <i class="el-icon-success"
             v-if="scope.row.cat_deleted === false"
             style="color: lightgreen;"></i>
          <i class="el-icon-error"
             v-else
             style="color: red;"></i>
        </template>

        <!-- 排序 -->
        <template slot="order"
                  slot-scope="scope">
          <el-tag type="primary"
                  size="mini"
                  v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success"
                  size="mini"
                  v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag type="warning"
                  size="mini"
                  v-else>三级</el-tag>
        </template>

        <!-- 操作 -->
        <template slot="option">
          <el-button type="danger"
                     size="mini"
                     icon="el-icon-delete">删除</el-button>
          <el-button type="primary"
                     size="mini"
                     icon="el-icon-edit">编辑</el-button>
        </template>
      </tree-table>

      <!-- 分页 -->
      <el-pagination @size-change="handleSizeChange"
                     @current-change="handleCurrentChange"
                     :current-page="query.pagenum"
                     :page-sizes="[1, 3, 5, 10]"
                     :page-size="query.pagesize"
                     layout="total, sizes, prev, pager, next, jumper"
                     :total="total">
      </el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类"
               :visible.sync="addCateDialogVisible"
               width="50%"
               @close="addCateDialogClosed()">
      <el-form :model="addCateForm"
               status-icon
               :rules="addCateRules"
               ref="addCateFormRef"
               label-width="100px">
        <el-form-item label="分类名称"
                      prop="cat_name">
          <el-input type="text"
                    v-model="addCateForm.cat_name"
                    autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- option:指定数据源
                :props:指定配置对象
           -->
          <el-cascader v-model="selectedKeys"
                       :options="parentCateList"
                       :props="cascaderProps"
                       @change="ParentCateChange"
                       clearable
                       change-on-select></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addCate()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类的数据列表，默认为空
      cateList: [],
      //查询条件
      query: { type: 3, pagenum: 1, pagesize: 5 },
      // 总数据条数
      total: 0,
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          type: "template", //是都将当前列定义为模板列
          template: "isok" // 当前这一列使用模板名称
        },
        {
          label: "排序",
          type: "template", //是都将当前列定义为模板列
          template: "order"
        },
        {
          label: "操作",
          type: "template",
          template: "option"
        }
      ],
      // 控制添加分类对话框显示/隐藏
      addCateDialogVisible: false,
      // 添加表单分类得分类对象
      addCateForm: {
        cat_name: "",// 将要添加分类的名称
        cat_pid: 0, // 将要添加分类的id
        cat_level: 0 // 将要添加分类的等级，默认是1级分类
      },
      // 添加分类输入框验证规则
      addCateRules: {
        cat_name: [
          {
            required: true,
            message: "请输入分类的名称",
            trigger: "blur"
          }
        ]
      },
      // 父级分类列表
      parentCateList: [],
      // 指定级联选择器配置对象
      cascaderProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      // 选中的父级分类id数组
      selectedKeys: []
    };
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$ajax.get("/categories", {
        params: this.query
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    // 监听pagesize大小的改变
    handleSizeChange (newSize) {
      this.query.pagesize = newSize;
      this.getCateList();
    },
    //监听pagenum的改变
    handleCurrentChange (newPage) {
      this.query.pagenum = newPage;
      this.getCateList();
    },
    showAddCateDialog () {
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    // 获取父级分类的数据列表
    async getParentCateList () {
      const { data: res } = await this.$ajax.get("/categories", {
        params: {
          type: 2
        }
      })

      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类列表失败");
      }
      this.parentCateList = res.data;
    },
    // 当级联选择器中的内容改变时调用
    ParentCateChange () {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 添加分类对话框按钮
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        console.log(this.addCateForm)
        const { data: res } = await this.$ajax.post("/categories", { data: this.addCateForm })
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类出错")
        }
        this.$message.success("添加分类成功")
        this.getCateList()
      })
      this.addCateDialogVisible = false
    },
    // 监听添加分类对话框关闭的时候 重置表单数据
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  },
  created () {
    this.getCateList();
  }
};
</script>

<style lang="less" scoped>
.tree_table {
  margin-top: 20px;
}

.el-cascader {
  width: 100%;
}
</style>
